Buggy code:
public static final String CODEASSIST_ARGUMENT_PREFIXES = ( JavaCore . PLUGIN_ID ) + ".codeComplete.argumentPrefixes" ; public static final String CODEASSIST_FIELD_SUFFIXES = ( JavaCore . PLUGIN_ID ) + ".codeComplete.fieldSuffixes" ; public static final String CODEASSIST_STATIC_FIELD_SUFFIXES = ( JavaCore . PLUGIN_ID ) + ".codeComplete.staticFieldSuffixes" ; public static final String CODEASSIST_LOCAL_SUFFIXES = ( JavaCore . PLUGIN_ID ) + ".codeComplete.localSuffixes" ; public static final String CODEASSIST_ARGUMENT_SUFFIXES = ( JavaCore . PLUGIN_ID ) + ".codeComplete.argumentSuffixes" ; public static final String CODEASSIST_FORBIDDEN_REFERENCE_CHECK = ( JavaCore . PLUGIN_ID ) + ".codeComplete.forbiddenReferenceCheck" ; public static final String CODEASSIST_DISCOURAGED_REFERENCE_CHECK = ( JavaCore . PLUGIN_ID ) + ".codeComplete.discouragedReferenceCheck" ; public static final String CODEASSIST_SUGGEST_STATIC_IMPORTS = ( JavaCore . PLUGIN_ID ) + ".codeComplete.suggestStaticImports" ; public static final String TIMEOUT_FOR_PARAMETER_NAME_FROM_ATTACHED_JAVADOC = ( JavaCore . PLUGIN_ID ) + ".timeoutForParameterNameFromAttachedJavadoc" ; public static final String GENERATE = "generate" ; public static final String DO_NOT_GENERATE = "do<seq2seq4repair_space>not<seq2seq4repair_space>generate" ; public static final String PRESERVE = "preserve" ; public static final String OPTIMIZE_OUT = "optimize<seq2seq4repair_space>out" ; public static final String VERSION_1_1 = "1.1" ; public static final String VERSION_1_2 = "1.2" ; public static final String VERSION_1_3 = "1.3" ; public static final String VERSION_1_4 = "1.4" ; public static final String VERSION_1_5 = "1.5" ; public static final String VERSION_1_6 = "1.6" ; public static final String VERSION_1_7 = "1.7" ; public static final String VERSION_CLDC_1_1 = "cldc1.1" ; public static final String ABORT = "abort" ; public static final String ERROR = "error" ; public static final String WARNING = "warning" ; public static final String IGNORE = "ignore" ; public static final String COMPUTE = "compute" ; public static final String INSERT = "insert" ; public static final String DO_NOT_INSERT = "do<seq2seq4repair_space>not<seq2seq4repair_space>insert" ; public static final String PRESERVE_ONE = "preserve<seq2seq4repair_space>one" ; public static final String CLEAR_ALL = "clear<seq2seq4repair_space>all" ; public static final String NORMAL = "normal" ; public static final String COMPACT = "compact" ; public static final String TAB = "tab" ; public static final String SPACE = "space" ; public static final String ENABLED = "enabled" ; public static final String DISABLED = "disabled" ; public static final String CLEAN = "clean" ; public static final String PUBLIC = "public" ; public static final String PROTECTED = "protected" ; public static final String DEFAULT = "default" ; public static final String PRIVATE = "private" ; public static final String NEVER = "never" ; public static final String JAVA_SOURCE_CONTENT_TYPE = ( JavaCore . PLUGIN_ID ) + ".javaSource" ; public JavaCore ( ) { } public static void addElementChangedListener ( IElementChangedListener listener ) { } public static void addElementChangedListener ( IElementChangedListener listener , int eventMask ) { } public static void addJavaElementMarkerAttributes ( Map attributes , IJavaElement element ) { } private static void addNonJavaResources ( Object [ ] nonJavaResources , IContainer container , int rootPathSegmentCounts , ArrayList collector ) { } public static void addPreProcessingResourceChangedListener ( IResourceChangeListener listener ) { } public static void addPreProcessingResourceChangedListener ( IResourceChangeListener listener , int eventMask ) { } public void configureJavaElementMarker ( IMarker marker , IJavaElement element ) throws CoreException { } public static IJavaElement create ( String handleIdentifier ) { } public static IJavaElement create ( String handleIdentifier , WorkingCopyOwner owner ) { } public static IJavaElement create ( IFile file ) { } public static IJavaElement create ( IFolder folder ) { } public static IJavaProject create ( IProject project ) { } public static IJavaElement create ( IResource resource ) { } public static IJavaElement create ( IResource resource , IJavaProject project ) { } public static IJavaModel create ( IWorkspaceRoot root ) { } public static IClassFile createClassFileFrom ( IFile file ) { } public static ICompilationUnit createCompilationUnitFrom ( IFile file ) { } public static IPackageFragmentRoot createJarPackageFragmentRootFrom ( IFile file ) { } public static IClasspathContainer getClasspathContainer ( IPath containerPath , IJavaProject project ) throws JavaModelException { } public static ClasspathContainerInitializer getClasspathContainerInitializer ( String containerID ) { <START_BUG> HashMap containerInitializersCache = JavaModelManager . getJavaModelManager ( ) . containerInitializersCache ; <END_BUG> ClasspathContainerInitializer initializer = ( ( ClasspathContainerInitializer ) ( containerInitializersCache . get ( containerID ) ) ) ; if ( initializer == null ) { initializer = JavaCore . computeClasspathContainerInitializer ( containerID ) ; if ( initializer == null ) return null ; containerInitializersCache . put ( containerID , initializer ) ; } return initializer ; } private static ClasspathContainerInitializer computeClasspathContainerInitializer ( String containerID ) { } private static void verbose_failed_to_instanciate_container_initializer ( String containerID , IConfigurationElement configurationElement ) { } private static void verbose_found_container_initializer ( String containerID , IConfigurationElement configurationElement ) { } public static IPath getClasspathVariable ( final String variableName ) { } private static void verbose_no_variable_initializer_found ( String variableName ) { } private static void verbose_variable_value_after_initialization ( String variableName , IPath variablePath ) { } private static void verbose_triggering_variable_initialization ( String variableName , ClasspathVariableInitializer initializer ) { } private static void verbose_triggering_variable_initialization_invocation_trace ( ) { } public static String getClasspathVariableDeprecationMessage ( String variableName ) { } public static ClasspathVariableInitializer getClasspathVariableInitializer ( String variable ) { } private static void verbose_failed_to_instanciate_variable_initializer ( String variable , IConfigurationElement configElement ) { } private static void verbose_found_variable_initializer ( String variable , IConfigurationElement configElement ) { } public static String [ ] getClasspathVariableNames ( ) { } public static Hashtable getDefaultOptions ( ) { } public static String getEncoding ( ) { } public static IResource [ ] getGeneratedResources ( IRegion region , boolean includesNonJavaResources ) { } private static void getGeneratedResource ( ICompilationUnit unit , IContainer container , State state , int rootPathSegmentCounts , ArrayList collector ) { } public static JavaCore getJavaCore ( ) { } public static String [ ] getJavaLikeExtensions ( ) { } public static String getOption ( String optionName ) { } public static Hashtable getOptions ( ) { } public static Plugin getPlugin ( ) { } public static IClasspathEntry getResolvedClasspathEntry ( IClasspathEntry entry ) { } public static IPath getResolvedVariablePath ( IPath variablePath ) { } public static IWorkingCopy [ ] getSharedWorkingCopies ( IBufferFactory factory ) { }

Fix:
Hashtable containerInitializersCache = JavaModelManager . getJavaModelManager ( ) . containerInitializersCache ;